EP4062913B1

EP4062913B1 - Solid oral formulation of utidelone

Info

Publication number: EP4062913B1
Application number: EP21863656.1A
Authority: EP
Inventors: Li Tang; Chuan Zhang; Rongguo Qiu
Original assignee: Beijing Biostar Pharmaceuticals Co Ltd; Chengdu Biostar Pharmaceuticals Ltd
Current assignee: Beijing Biostar Pharmaceuticals Co Ltd; Chengdu Biostar Pharmaceuticals Ltd
Priority date: 2020-09-02
Filing date: 2021-09-02
Publication date: 2024-05-08
Anticipated expiration: 2041-09-02
Also published as: ES2981041T3; JP7536098B2; EP4062913C0; BR112023003572A2; EP4062913A1; AU2021337086B2; JP2023508090A; PL4062913T3; HUE066812T2; CA3184960A1; CN114727995A; CN114727995B; WO2022048592A1; EP4062913A4; US20230048901A1; AU2021337086A1; KR20230024389A

Description

Technical Field

The present application belongs to pharmaceutical field, and specifically relates to a solid oral formulation of Utidelone and use thereof.

Background Art

Utidelone is a class of epothilone derivatives belonging to macrolides and secondary metabolites produced by the genetically modified Sorangium Cellulosum. Studies have shown that epothilones have the same pharmacological mechanism as paclitaxel, which exerts antitumor effect by inhibiting the depolymerization of tubulin. The chemical name of Utidelone is: 4,8-dihydroxy-5,5,7,9,13-pentamethyl-16-[1-methyl-2-(2-methyl-thiazole-4-yl)-vinyl]-hexadecoxetane-13-en-2,6-one lactone with the chemical structure as shown below:
Utidelone injection (brand name:
^™), strength 5 ml: 50 mg, intravenous infusion for about 1.5 hours, dose 30-40 mg/m2/day, administered once a day for 5 consecutive days, 21 days as a treatment cycle, until disease progression or intolerable toxicity. Utidelone injection needs to be diluted with normal saline for injection (the final concentration of Utidelone is 0.2 mg/ml to 0.5 mg/ml) before use. It is used to treat patients with advanced breast cancer, lung cancer, gastric cancer, liver cancer and other solid tumors.
Utidelone is easily soluble in ethanol, methanol, ethyl acetate, and chloroform, but insoluble in water. The saturated solubility in water is less than 1 µg/ml, so it is difficult to develop into an oral formulation with suitable bioavailability. At present, the marketed epothilone antitumor drugs such as Utidelone injection and Ixabepilone injection etc., all of which use non-aqueous solvents such as ethanol and polyoxyl castor oil as solvents, are diluted with sodium chloride injection for administration by intravenous infusion. Since polyoxyl castor oil is a strong allergenic substance, antiallergic treatment must be given before intravenous administration, which reduces the compliance of this type of drug in clinical use, increases the adverse reactions of patients, and limits its clinical application.
Solid oral formulations of epothilone compounds are rare, and pharmaceutical formulations for intravenous injection are usually used for oral administration, such as those described in patent CN 101112373 . Epothilone compounds are prone to ring-opening degradation in solution state and crystallize out due to poor solubility in the body, therefore the pharmaceutical formulations containing epothilone compounds in the form of solution for oral administration usually have poor stability, high irritation, and low bioavailability, are thus not pharmaceutically feasible. Therefore, it is an industry consensus to develop an oral formulation with high bioavailability and high drug stability.
Lam et al. 2011 (Cancer Chemother Pharmacol (2012), 69: 523-531) relates to a Phase I dose escalation study of the epothilone KOS-1584. KOS-1584 is administered intravenously in the study.
US 2006/134214 relates to enteric coated beads comprising epothilone or epothilone analogs, and a capsule comprising a multitude of such beads. The beads disclosed comprise enteric coating.
US 2019/070152 relates to pharmaceutical preparations comprising a de-epoxidized epothilone and use thereof in the treatment of tumors. The pharmaceutical preparations disclosed are liquid formulations.

Summary

The invention is defined by the claims. Any subject matter falling outside the scope of the claims is provided for information purposes only.
In order to solve the above-mentioned problems, the present application provides an oral formulation using Utidelone as an active ingredient and a preparation method thereof. The oral formulation of the present application has high bioavailability and good physical and chemical stability, making it possible to administer such an active ingredient orally, improving medication compliance, and eliminating the strong allergic reaction caused by administering polyoxyl castor oil via injection.
The oral formulations of the present application not only effectively improves the solubility of Utidelone, but also solves the in vivo and in vitro stability of Utidelone, significantly improves the bioavailability of the formulation, and establishes a process for preparing the drug suitable for industrialized large-scale production. Moreover the dissolution and bioavailability of the solid oral formulations of the present application have been shown good bioavailability by the data.
According to one aspect, the present application provides a solid oral formulation comprising Utidelone, or a pharmaceutically acceptable salt, solvate or ester thereof as an active ingredient and a pharmaceutically acceptable excipient, wherein the formulation is a micropellet capsule encapsulating micropellets, or a tablet prepared by micropellet compression, wherein the micropellets are pellet cores coated with a coating layer comprising the active ingredient and said pharmaceutically acceptable excipient, wherein the pharmaceutically acceptable excipient comprises a hydrophilic pharmaceutical excipient, a sustained-release pharmaceutical excipient, and optionally a surfactant, and wherein the ratio of the active ingredient to the pharmaceutically acceptable excipient is in the range of 1:1 to 1:30.
In general, poorly soluble drugs may improve their solubility by reducing the particle size of API, preparing solid dispersions with hydrophilic carriers, and adding surfactants, etc. thereby improving the bioavailability of the drugs. Due to the extremely poor water solubility of Utidelone, it is difficult to obtain an ideal dissolution of the drug by the above mentioned general means such as reducing the particle size of the drug and adding surfactants. Therefore, it is very challenging and creative to obtain oral formulations with good physical and chemical stability and enhanced solubility and oral bioavailability of Utidelone.
The oral solid formulation containing Utidelone of the present application contains API (ie, active ingredient: Utidelone or a pharmaceutically acceptable salt, solvate or ester thereof) and pharmaceutical excipients. The oral formulation contains: 1) Utidelone or a pharmaceutically acceptable salt, solvate or ester thereof; 2) at least one hydrophilic pharmaceutical excipient; 3) at least one sustained-release pharmaceutical excipient; and 4) optional at least one surfactant.
The present application is not only applicable to Utidelone, but also to pharmaceutically acceptable salts, solvates or esters thereof.
According to some embodiments, the solid oral formulation of the present application, for example, in the form of a micropellet capsule, may contain: 1) Utidelone or a pharmaceutically acceptable salt, solvate or ester thereof; 2) at least one hydrophilic pharmaceutical excipient; 3) at least one sustained-release pharmaceutical excipient; and 4) at least one surfactant.
In the oral formulation of the present application, the ratio of Utidelone to the pharmaceutical excipients is in the range of 1:1 to 1:30, preferably 1:5 to 1:20.
The pellets in a micropellet capsule of the present application include a pill core (namely, pill cores) and a coating layer containing the drug. The pill core, for example, may be a circular or oval pharmaceutical excipient with a particle size of 100-1000 um. The scaffold material used for tablets or pill core is generally referred to as a pill core material, such as sucrose, starch, lactose, microcrystalline cellulose, mannitol and biodegradable polymers, etc.
The micropellet capsule or tablet contains about 2%-10% (w/w) of Utidelone, about 30%-70% (w/w) of pharmaceutical excipients, and about 20%-60% (w/w) pellet core material, calculated based on the total weight of pellets or tablets. Preferably, each capsule may contain 5-30 mg of Utidelone, and each tablet may contain about 5-20 mg of Utidelone.
The pill cores used in the preparation of micropellets for the oral formulation of the present application are selected from pill cores made of sucrose, starch, and microcrystalline cellulose ect., and sucrose pill core is preferable. The diameter of the pill core is 0.2 mm to 1.5 mm, preferably 0.4 mm to 1.0 mm. The particle size of the drug-coated pellets is 0.5-1.5 mm.
The hydrophilic pharmaceutical excipients in the oral formulations (such as micropellet capsules) of the present application are selected from one of povidone, hypromellose, mannitol, lactose, sucrose, poloxamer, polyvinyl alcohol, etc. or the mixtures thereof, for example, selected from low viscosity hypromellose, povidone and poloxamer.
The sustained-release pharmaceutical excipients in the oral formulations (such as micropellet capsules) of the present application are selected from one of povidone, hypromellose, polyethylene glycol, ethyl cellulose, polyvinyl acetal diethylamine acetate, hypromellose acetate succinate, acetate methacrylate copolymer, cellulose acetate, methyl cellulose, polyacrylic resin, polyvinyl phthalate, cellulose phthalate, and hypromellose phthalate, or the mixtures thereof, such as selected from the group consisting of high-viscosity hypromellose, high-viscosity polyethylene glycol, ethyl cellulose, and cellulose acetate.
The surfactant in the oral formulation of the present application (such as micropellet capsule) is selected from one of polysorbate, polyoxyl castor oil, sodium lauryl sulfate, cholate, fatty acid glyceride, sorbitan, polyoxyethylene fatty acid ester, polyoxyethylene fatty alcohol ether, and poloxamer, or the mixtures thereof. Preferred is polyoxyl castor oil, and second preferred is polysorbate or poloxamer.
According to one embodiment, the present application provides a solid oral formulation, such as a micropellet capsule, which uses Utidelone as the active ingredient and polyoxyethylene (40) hydrogenated castor oil, low-viscosity hypromellose (such as E50), and high-viscosity hypromellose (such as K100) as pharmaceutical excipients, and sucrose as the pill core.
Micropellet capsules containing Utidelone can be prepared as follows: dissolving Utidelone and the excipients in a solvent, which is then coated on pill cores to prepare micropellets, and finally encapsulated in capsules or compressed into tablets. This preparation method solves the problem of poor water solubility of Utidelone which results in poor drug bioavailability of the pharmaceutical preparation prepared by solid dispersion technology having the defects such as in vitro and in vivo recrystallization. Meanwhile, the oral formulation of the present application does not need to strictly control the particle size and crystal form of the API to ensure the stability of the preparation process. The dust generation in the production process is low, and it may be fully enclosed for preparation to reduce occupational hazards and other advantages. Utidelone exists in amorphous or molecular form in the oral solid preparation.
The above-mentioned oral formulation containing Utidelone and its preparation process have at least one of the following characteristics:

1) The oral formulation contains at least one hydrophilic pharmaceutical excipient to improve the solubility of the drug.
2) The oral formulation contains sustained-release pharmaceutical excipients to inhibit the release rate of the drug in the solid dispersion prepared with hydrophilic pharmaceutical excipients, thereby reducing the supersaturated concentration of the drug and inhibiting recrystallization of the drug in the body.
3) The oral formulation may contain one or more surfactants to further inhibit the recrystallization of the drug in vitro and in vivo, and also play a certain plasticizing role in the preparation process of pellets to increase the toughness of the finished micropellets.
4) During the preparation process, Utidelone needs to be first dissolved in an organic solvent or a mixture of organic solvents or a mixture of organic solvents and water.
5) During the preparation process, Utidelone dissolved in an organic solvent or a mixture of organic solvents or a mixture of organic solvents and water needs to be mixed with hydrophilic pharmaceutical excipients and/or sustained-release pharmaceutical excipients and/or surfactants, and optional other pharmaceutical excipients for co-drying to prepare a solid dispersion with higher solubility or micropellets with both higher solubility and sustained-release properties.

Above-mentioned organic solvent is a pharmaceutically acceptable organic solvent selected from the group consisting of ethanol, methanol, ethyl acetate, acetone, dichloromethane, chloroform, and the like. For example, ethanol, methanol, ethyl acetate or acetone, or a mixture of the above-mentioned two or more solvents mixed in any proportion.
The above-mentioned co-drying process is mainly fluidized bed coating process, spray drying process, reduced pressure vacuum drying process, heating drying, freeze drying and other drying processes.
The oral formulation of the present application, which is suitable for human patients (or animals), includes solid preparations such as soft and hard capsules, tablets, or micropellets such as micropellet capsules.
The daily dosage and frequency of administration may be based on commercially available unit formulations, and the daily dosage of the oral formulations of the present application may be obtained by administering half-unit, single unit, or more unit formulations
According to another aspect, the formulation of the present application is for use in a method of treatment of human or animal cancers. As used herein, cancers refer to various forms of cancers, and tumors refer to solid tumors, including breast cancer, lung tumors, digestive tract tumors, lymphoid tumors, prostate cancer, brain cancer, gynecological tumors, liver cancer, head and neck tumors, for example, breast cancer, lung cancer, liver cancer, ovarian cancer, colon cancer and stomach cancer.

Definition of Terms

Pharmaceutical excipients refer to the excipients and additives used in formulating or producing medicines. They are substances other than active ingredients that have been reasonably evaluated in terms of safety and are included in pharmaceutical formulations.
Pill core (or called as pellet core) is a necessary starting master for the preparation of the matrix sustained release production.
Hydrophilic pharmaceutical excipients refer to pharmaceutical excipients that have a strong affinity for water, may attract water molecules, or are easily soluble in water. Sustained-release pharmaceutical excipients refer to the materials that may release the drug slowly to prolong the action time of the drug, which may be used to prepare medicaments, for example microcapsules, that may carry the drug and release it slowly.
Low-viscosity hypromellose refers to hypromellose with a viscosity of <80 mPa.S. For example, hypromellose E5, E3, E15, E50, K3, etc.
High-viscosity hypromellose refers to hypromellose with a viscosity of ≥80 mPa.S. For example, hypromellose K100LV, K100M, K100LVP, K4M, E4M, E4MP, K100MP, etc.
High-viscosity polyethylene glycol refers to polyethylene glycol with molecular weight of >1000, such as PEG1000, PEG2000, PEG4000, PEG8000, etc..
The present application has the following advantages;

1. The bioavailability of the oral formulation of the present application is high, even up to more than 55%.
2. The particle size and crystal form of the API do not need to be strictly controlled as in the preparation process of conventional oral solid formulations. After dissolving the active ingredient in a soluble organic solvent, it is sprayed onto the blank pill core through a coating process, and the Utidelone in the micropellet obtained after drying exists in the micropellet or powder in amorphous and molecular states and has a certain stability.
3. The preparation process of the oral formulation of the present application may adopt an integrated molding process. In the process of preparation, a closed operation is basically adopted, which may effectively avoid occupational exposure hazards caused by cytotoxic compounds.
4. The total yield of the oral formulation of the present application reaches more than 90%, which is far higher than the total yield of materials of conventional oral solid preparations.
5. The active ingredient of Utidelone in the solid oral formulation of the present application exists in an amorphous or molecular form, rather than in a crystalline form.

Description of Drawings

Figure 1 : Dissolution profile of the oral formulation of Example 1;
Figure 2 : Dissolution profile of the oral formulation of Example 2;
Figure 3 : Dissolution profile of the oral formulation of Example 3;
Figure 4 : Dissolution profile of the oral formulation of Example 4;
Figure 5A : Dissolution profile of the oral formulation of Example 5-A;
Figure 5B : Dissolution profile of the oral formulation of Example 5-B;
Figure 6 : Area under the plasma concentration-time curve of Utidelone injection;
Figure 7 : Area under the plasma concentration-time curve of Utidelone capsules of Example 1;
Figure 8 : Area under the plasma concentration-time curve of Utidelone injection;
Figure 9 : Area under the plasma concentration-time curve of Utidelone capsules of Example 5-A;
Figure 10 : X-ray diffraction pattern of a crystal form of Utidelone;
Figure 11 : X-ray diffraction pattern of the amorphous form of Utidelone;
Figure 12 : X-ray diffraction pattern of the pharmaceutical excipients (inactive ingredients) used in the Utidelone capsules prepared in Example 5-A;
Figure 13A : X-ray diffraction pattern of the contents contained in the Utidelone capsules (stored at room temperature) prepared in Example 5-A;
Figure 13B : HPLC chromatogram of the contents contained in the Utidelone capsules (stored at room temperature) prepared in Example 5-A.

Embodiments

The present application is further described below in conjunction with examples.

Material:

Utidelone used in the formulations of the following examples was manufactured by Chengdu Huahao Zhongtian Pharmaceutical Co., Ltd., and the implementation standards of all excipients are the national approval or the 2020 edition of the Chinese Pharmacopoeia. Among them, polyoxyethylene (40) hydrogenated castor oil was made by BASF China Co., Ltd., hypromellose E50 was made by Rohm and Haas, hypromellose K100 was made by Rohm and Haas, pill cores (sucrose) were made by Shanghai Colorcon Coating, and Vacant Hypromellose Capsules were manufactured by Suzhou Capsule Co., Ltd. However, the excipients used in the oral solid formulations of the following examples are not limited by the manufacturer.

Example 1: Utidelone oral solid formulations

Material	Amount (Formulation 1)	Amount (Formulation 2)
Utidelone	15g	15g
Povidone K30	155g	110g
Polyoxyethylene (40) Hydrogenated Castor Oil	30g	30g
Hypromellose E5	0	45g
Sugar Spheres	100g	100g
anhydrous ethanol	2800g	2800g
purified water	1200g	1200g

Take the indicated amount of Utidelone, polyoxyethylene (40) hydrogenated castor oil, and povidone K30 in a beaker to be dissolved with the amount of anhydrous ethanol, and then add the amount of purified water and mix well or slowly add hypromellose E5 aqueous solution and stir for about approx. 1 hour to mix well. The hypromellose E5 aqueous solution was obtained by adding the indicated amount of hypromellose E5 to the amount of purified water while stirring to dissolve. In the multifunctional granulation and coating machine, the indicated amount of pill core was added, and coated with the above obtained solution containing drug. After coated, fully dried and discharged, and the obtained pellets were filled into capsules. Each capsule was filled with 10-30mg of Utidelone.

Dissolution Test:

The test sample was capsules containing 20 mg of Utidelone. According to "Chinese Pharmacopoeia" 2020 Edition Appendix 0931 Dissolution and Release Determination Method 1, capsules were added to a rotating basket at a rotation speed of 100 rpm, in the dissolution medium of 900ml phosphate buffer with pH 6.8. The release was determined by high performance liquid chromatography, with a C18 chromatographic column, acetonitrile: water=(65:35) as the mobile phase, at 30 °C of column temperature, detected at a wavelength of 250 nm. The dissolution profile is shown in Figure 1.
Using the hydrophilic carrier material as a solid dispersant, after the carrier and Utidelone were prepared into a solid dispersion, although the solubility of the drug was significantly improved, the dissolved drug was prone to recrystallization in the body, thereby reducing the bioavailability of the drug. The bioavailability in the beagle of this example was 29%.

Example 2: Utidelone oral solid formulations

Material	Amount
Utidelone	15g
Polyoxyethylene (40) Hydrogenated Castor Oil	30g
Hypromellose E5	155g
Sugar Spheres	100g
Ethyl cellulose	11g
polyethylene glycol
400	15g
anhydrous ethanol	2800g
purified water	1200g

Take the indicated amount of Utidelone and polyoxyethylene (40) hydrogenated castor oil in a beaker to be dissolved with the amount of anhydrous ethanol and then slowly add hypromellose E5 aqueous solution and stir for about approx. 1 hour to mix well. The hypromellose E5 aqueous solution was obtained by adding the indicated amount of hypromellose E5 to the amount of purified water while stirring till dissolved. In the multifunctional granulation and coating machine, the indicated amount of pill core was added, and coated with the above solution obtained. After coated, fully dried and discharged to render pellets containing the drug.
Take 11 g of ethyl cellulose and 1.5 g of polyethylene glycol 400 into a beaker to dissolve with 175 ml of absolute ethanol, and then add water to dilute to 250 ml to obtain a controlled release coating solution. The drug-containing pellets were coated with the controlled-release coating solution in fluidized bed, and the coating weight increased by about 4%. After coated, age at 40 °C for more than 2 hours to obtain Utidelone sustained-release pellets which were then filled in capsules.

Dissolution Test:

The test sample was capsules containing 20 mg of Utidelone. According to "Chinese Pharmacopoeia" 2020 Edition Appendix 0931 Dissolution and Release Determination Method 1, capsules were put into a rotating basket at a rotation speed of 100 rpm, in the dissolution medium of 900ml phosphate buffer with pH 6.8. The release was determined by high performance liquid chromatography, with a C18 chromatographic column, acetonitrile: water = (65:35) as the mobile phase, at 30 °C of column temperature, detected at a wavelength of 250 nm. The dissolution profile is shown in Figure 2.

Example 3:

Utidelone oral solid formulations

Material	Amount
Utidelone	15g
Polyoxyethylene (40) Hydrogenated Castor Oil	30g
Hypromellose E50	80g
Hypromellose K100	25g
Sugar Spheres	100g
anhydrous ethanol	3000g
purified water	1400g

Take the indicated amount of Utidelone and polyoxyethylene (40) hydrogenated castor oil in a beaker to be dissolved with the amount of anhydrous ethanol and then slowly add hypromellose aqueous solution and stir for about approx. 1 hour to mix well. The hypromellose aqueous solution was obtained by adding the indicated amount of hypromellose E50 and hypromellose K100 to the amount of purified water while stirring till dissolved. In the multifunctional granulation and coating machine, the indicated amount of pill core was added, and coated with the above solution obtained. After coated, fully dried and discharged to render pellets containing the drug.

Dissolution Test:

The test sample was capsules containing 20 mg of Utidelone. According to "Chinese Pharmacopoeia" 2020 Edition Appendix 0931 Dissolution and Release Determination Method 1, capsules were put into a rotating basket at a rotation speed of 100 rpm, in the dissolution medium of 900ml phosphate buffer with pH 6.8. The release was determined by high performance liquid chromatography, with a C18 chromatographic column, acetonitrile: water = (65:35) as the mobile phase, at 30 °C of column temperature, detected at a wavelength of 250 nm. The dissolution profile is shown in Figure 3.

Example 4:

Utidelone oral solid formulations

Material	Amount
Utidelone	15g
Polyoxyethylene (40) Hydrogenated Castor Oil	30g
Hypromellose E50	95g
Ethyl cellulose	10g
Sugar Spheres	100g
anhydrous ethanol	2800g
purified water	1200g

Take the indicated amount of Utidelone and polyoxyethylene (40) hydrogenated castor oil and ethyl cellulose in a beaker to be dissolved with the amount of anhydrous ethanol and then slowly add hypromellose aqueous solution and stir for about approx. 1 hour to mix well. The hypromellose aqueous solution was obtained by adding the indicated amount of hypromellose E50 to the amount of purified water while stirring till dissolved. In the multifunctional granulation and coating machine, the indicated amount of pill core was added, and coated with the above solution obtained. After coated, fully dried and discharged to render pellets containing the drug, which were then filled into capsules.

Dissolution Test:

The test sample was capsules containing 20 mg of Utidelone. According to "Chinese Pharmacopoeia" 2020 Edition Appendix 0931 Dissolution and Release Determination Method 1, capsules were put into a rotating basket at a rotation speed of 100 rpm, in the dissolution medium of 900ml phosphate buffer with pH 6.8. The release was determined by high performance liquid chromatography, with a C18 chromatographic column, acetonitrile: water = (65:35) as the mobile phase, at 30 °C of column temperature, detected at a wavelength of 250 nm. The dissolution profile is shown in Figure 4.

Example 5-A

Utidelone oral solid formulations

Material	Amount
Utidelone	15g
Polyoxyethylene (40) Hydrogenated Castor Oil	30g
Hypromellose E50	60g
Hypromellose K100	45g
Sugar Spheres	100g
anhydrous ethanol *	3000g
purified water *	1400g
Vacant Hypromellose Capsules	as needed

*: Solvent used in the process and finally removed.

Take the indicated amount of Utidelone and polyoxyethylene (40) hydrogenated castor oil and ethyl cellulose in a beaker to be dissolved with the amount of anhydrous ethanol and then slowly add hypromellose aqueous solution and stir for about approx. 1 hour to mix well. The hypromellose aqueous solution was obtained by adding the indicated amount of hypromellose E50 and K100 to the amount of purified water while stirring till dissolved. In the multifunctional granulation and coating machine, the indicated amount of pill core was added, and coated with the above solution obtained. After coated, fully dried and discharged to render pellets containing the drug, which were then filled into capsules.

Dissolution Test:

The test sample was capsules containing 20 mg of Utidelone. According to "Chinese Pharmacopoeia" 2020 Edition Appendix 0931 Dissolution and Release Determination Method 1, capsules were put into a rotating basket at a rotation speed of 100 rpm, in the dissolution medium of 900ml phosphate buffer with pH 6.8. The release was determined by high performance liquid chromatography, with a C18 chromatographic column, acetonitrile: water = (65:35) as the mobile phase, at 30 °C of column temperature, detected at a wavelength of 250 nm. The dissolution profile is shown in Figure 5A. The in vitro dissolution characteristics of the prepared samples meet the expected goals. They were dissolved about 57% at 30 minutes and about 99% at 60 minutes, and there was no burst or incomplete release occurred.

Example 5-B

The preparation method and dissolution testing method of the micropellet capsule in this example are the same as those in Example 5-A.

Material	Amount
Utidelone	15g
Polyoxyethylene (40) Hydrogenated Castor Oil	30g
Hypromellose E50	80g
Hypromellose K100	30g
Sugar Spheres	100g
anhydrous ethanol *	2500g
purified water *	2000g
Vacant Hypromellose Capsules	as needed

The dissolution profiles are shown in Figure 5B, showing good release uniformity for capsules prepared in multiple batches (as shown in Figure 5B).

Example 6

Utidelone oral solid formulations

Material	Amount
Utidelone	15g
Polyoxyethylene (40) Hydrogenated Castor Oil	30g
Hypromellose E50	60g
Hypromellose K100	45g
Sugar Spheres	75g
Povidone K30	50g
lactose	125g
talcum powder	5g
anhydrous ethanol	3000g
purified water	1400g

Take the indicated amount of Utidelone and polyoxyethylene (40) hydrogenated castor oil in a beaker to be dissolved with the amount of anhydrous ethanol and then slowly add hypromellose aqueous solution and stir for about approx. 1 hour to mix well. The hypromellose aqueous solution was obtained by adding the indicated amount of hypromellose E50 and K100 to the amount of purified water while stirring till dissolved. In the multifunctional granulation and coating machine, the indicated amount of pill core was added, and coated with the above solution obtained. After coated, fully dried and discharged to render pellets containing the drug. Mix the pellets with povidone K30, lactose and talc powder evenly, and press into tablets to obtain Utidelone tablets.

Example 7

Utidelone oral solid formulations

Material Amount

Utidelone 15g

Polyoxyethylene (40) Hydrogenated Castor Oil 10g

Povidone K30 120g

lactose 100g

Hypromellose K100M 150g

talcum powder 5g

anhydrous ethanol 600g
Take the indicated amount of Utidelone, polyoxyethylene (40) hydrogenated castor oil and povidone K30 in a beaker to be dissolved with the amount of anhydrous ethanol and mix evenly to obtain a solution containing Utidelone. The solution was spray-dried with a multifunctional granulation coating machine to obtain a solid dispersion of Utidelone. After dry granulation of the solid dispersion, lactose, hypromellose K100M and talc powder, tablet pressing was performed to obtain the Utidelone tablets.

Example 8

Utidelone oral solid formulations

Material Amount

Utidelone 15g

polyethylene glycol 6000 155g

Tween

80 30g

Sugar Spheres 100g

anhydrous ethanol 1500g

purified water 500g
Take the indicated amount of Utidelone, polyoxyethylene (40) hydrogenated castor oil, Tween 80, and polyethylene glycol 6000 in a beaker to dissolve with the amount of absolute ethanol, then add purified water, and mix well. In the multifunctional granulation and coating machine, the indicated amount of pill cores was added, and coated with the above solution obtained. After coated, fully dried and discharged to render pellets containing the drug, which were then filled into capsules.

Example 9

Utidelone oral solid formulations

Material Amount

Utidelone 15g

Poloxamer 407 65g

polyethylene glycol 8000 85g

Sugar Spheres 100g

anhydrous ethanol 1500g

purified water 500g
Take the indicated amount of Utidelone, Poloxamer 407, and polyethylene glycol 8000 in a beaker to dissolve with the amount of absolute ethanol, then add purified water, and mix well. In the multifunctional granulation and coating machine, the indicated amount of pill cores was added, and coated with the above solution obtained. After coated, fully dried and discharged to render pellets containing the drug, which were then filled into capsules.

Example 10

Utidelone oral solid formulations

Material Amount

Utidelone 15g

polyethylene glycol 6000 155g

Polyoxyethylene (40) Hydrogenated Castor Oil 30g

Povidone K90 15g

lactose 100g

silica 155g

anhydrous ethanol 1000g
Take the indicated amount of Utidelone, polyoxyethylene (40) hydrogenated castor oil and polyethylene glycol 6000 in a beaker to be dissolved with the amount of anhydrous ethanol and mix evenly to obtain a solution containing Utidelone. The solution was spray-dried with a multifunctional granulation coating machine to obtain a solid dispersion of Utidelone. After dry granulation of the solid dispersion, lactose, silica and povidone K90, tablet pressing was performed to obtain the Utidelone tablets.

Example 11

Utidelone oral solid formulations

Material	Amount
Utidelone	15g
polyethylene glycol
4000	150g
Poloxamer 407	30g
Glyceryl Behenate	30g
Polyvinylpyrrolidone	5g
sucrose	100g
Micro powder silica	100g
Anhydrous ethanol	1500g

Take the indicated amount of Utidelone, Poloxamer 407 and polyethylene glycol 4000 in a beaker to be dissolved with the amount of anhydrous ethanol and mix evenly to obtain a solution containing Utidelone. The solution was spray-dried with a multifunctional granulation coating machine to obtain a solid dispersion of Utidelone. After dry granulation of the solid dispersion, lactose, silica, glyceryl behenate, and polyvinylpyrrolidone, tablet pressing was performed to obtain Utidelone tablets.

Example 12

Utidelone oral solid formulations

Material Amount

Utidelone 15g

Polysorbate

80 30g

lactose 110g

Cellulose acetate 45g

pill core 100g

anhydrous ethanol 3000g

purified water 1400g
Take the indicated amount of Utidelone, polysorbate 80, and cellulose acetate in a beaker to dissolve with the amount of absolute ethanol, then add slowly lactose aqueous water obtained by dissolving lactose into the amount of purified water while stirring, and mix well by stirring for about 1 hour. In the multifunctional granulation and coating machine, the indicated amount of pill cores was added, and coated with the above solution obtained. After coated, fully dried and discharged to render pellets containing the drug, which were then filled into capsules.

Example 13: Bioavailability Test

1. Bioavailability of Utidelone Capsules prepared in Example 1

Experiment Method:

Four Beagle dogs were divided into two groups, one group was administered orally Utidelone micropellets 1mg/kg in the first test; in the other group, each dog was administered by intravenous infusion 1mg/kg of Utidelone injection in the first test. Intravenous blood was collected at 0.5h, 1h, 1.5h, 2h, 2.5h, 3h, 4h, 6h, 8h, 12h, 24h before administration and after administration. After the samples were centrifuged to separate the plasma, the concentration of Utidelone in the plasma was determined by LC-MS/MS. The test results are shown in Figure 6.

The pharmacokinetic data of Utidelone Injection and Utidelone Capsules (Example 1) are shown in the following table.

Table 1: PK/PD data of Utidelone injection

PK parameters	Unit	First Time		Second Time		Mean
PK parameters	Unit	101#	102#	111#	112#	Mean
K_el	h-1	0.15	0.06	0.11	0.14	0.12
t_1/2	h	4.48	11.46	6.21	5.01	6.79
Tmax	h	1.5	1.5	1.5	1.5	1.500
Cmax	ng·mL^-1	2320	1590	2900	3090	2475
AUC_0-t	ng·h·mL^-1	7964.9	6526.3	10780.5	10327.3	8899.7
AUC_0-inf	ng·h·mL^-1	8352.6	7435.9	12195.5	11031.8	9753.9
AUMC_0-t	ng·h²·mL^-1	37593.0	37436.3	68136.5	54171.7	49334.4
AUMC_0-inf	ng·h²·mL^-1	49405.1	74313.1	114769.0	76174.5	78665.4
MRT_IV	h	5.91	9.99	9.41	6.91	8.06
CL	mL·kg^-1·h^-1	119.7	134.5	82.0	90.6	106.7
Vd_ss	mL·kg^-1	773.7	2224.2	734.3	655.6	1097.0

Table 2: PK/PD data of Utidelone capsules (Example 1)

PK parameters	Unit	Second Time		First Time		Mean
PK parameters	Unit	101#	102#	111#	112#	Mean
K_el	h^-1	0.15	0.20	0.19	0.12	0.16
t_1/2	h	4.48	3.53	3.69	5.84	4.39
Tmax	h		1	0.5	0.5	2	1.000
Cmax	ng·mL^-1	439.0	577.0	998.0	456.0	618
AUC_0-t	ng·h·mL^-1	1985.3	2511.7	3463.7	2806.9	2691.9
AUC_0-inf	ng·h·mL^-1	2134.7	2575.9	3587.6	3126.9	2856.3
AUMC_0-t	ng·h²·m L^-1	9707.6	10242.5	13860.4	18067.8	12969.6
AUMC_{0- inf}	ng·h²·m L^-1	14261.0	12111.9	17493.1	28442.4	18077.1
MRT_PO	h	4.89	4.08	4.00	6.44	4.85
F	%	21.9	26.4	36.8	32.1	29.3

The average relative bioavailability of the oral formulation of Example 1 can reach about 29%.
Using the same test method, the average relative bioavailability of the oral formulations prepared in Examples 2, 3, and 4 was found to be between 30-50%.

2. The bioavailability test of the oral formulations prepared in Examples 5 and 6

Experimental Method:

Six Beagle dogs were divided into two groups, with 3 dogs in each group. In the first group, each dog was orally administered with 1.5 mg/kg of Utidelone capsules of Example 5-A. Each dog in the other group received an intravenous infusion of 1 mg/kg of Utidelone as reference. Intravenous blood was collected at 0.5h, 1h, 1.5h, 2h, 2.5h, 3h, 4h, 6h, 8h, 12h, 24h before administration and after administration. After the samples were centrifuged to separate the plasma, the concentration of Utidelone in the plasma was determined by LC-MS/MS. The results of the injection test are shown in Figure 8, and the experimental results of the capsules are shown in FIG. 9.

The pharmacokinetic data of Utidelone injection and Utidelone capsules (Example 5-A) are shown in Table 3 below.

Table 3: Mean values of pharmacokinetic parameters after a single intravenous administration of Utidelone injection and oral administration of Utidelone capsules in beagle dogs.

Parameters	Mean values
Parameters	intravenous administration	oral administration SD
Kel (h^-1)	0.12 ± 0.04	0.16 ± 0.13
T_1/2 (h)	6.18 ± 2.57	8.70 ± 6.70
T_max (h)	1.5 ± 0.00	0.75 ± 0.43
C_max (ng/mL)	1273 ± 351	2410 ± 1331
AUC_0-t	3686 ± 733	4166 ± 2164
AUC_0-∞	3789 ± 653	4459 ± 2298
AUMC_0-t	15252 ± 373	12665 ± 5968
AUMC_0-inf	19017 ± 3458	24715 ± 16308
MRT (h)	4.47 ± 1.87	4.89 ± 5.88
CL (mL·h)	2694 ± 474	-
Vd_ss (mL)	25031 ± 14804	-

The relative bioavailability of Utidelone capsules after a single oral administration ranged from 53.1% to 103.8%, with an average relative bioavailability of 78.5%.
With the test method of Example 5-A, it was measured that the average relative bioavailability of the Utidelone tablets prepared in Example 6 reached more than 55%.

Example 14: Stability

Utidelone capsules (Examples 1 and 5) were stored under the accelerated test conditions of 40°C and 75% RH, and the related substance detection results after 1 month of storage showed that the degradation impurities in the product were within the range specified by ICH Q3. It shows that the oral formulation of Utidelone of the present invention has good stability.
Utidelone capsules (Examples 1 and 5) were stored under the accelerated test conditions of 40°C and 75% RH. The X-ray diffraction analysis of the preparations after 1 month of storage showed that the Utidelone in the capsules exists in an amorphous or molecular form.

Example 15: Preparation of Amorphous Utidelone

Method 1:

Dissolve 1 g of Utidelone in 5 ml of dichloromethane or chloroform or any two or three mixed solvents of dichloromethane, chloroform and ethyl acetate, and dried under reduced pressure of -0.05Mpa at 30°C~80°Cto obtain the target product.

Method 2:

Dissolve 1g of Utidelone in 5ml of dichloromethane or chloroform or any two or three mixed solvents of dichloromethane, chloroform and ethyl acetate, and spray-dry it with a fluidized bed with feed and inlet air temperature of ≥30°C to obtain the target product.

Method 3:

Dissolve 1 g of Utidelone in 10 ml of methanol or ethanol, and evaporate to dryness under reduced pressure with a rotary evaporator to obtain the target product.
The X-ray diffraction pattern of amorphous Utidelone is shown in FIG. 11 .
Utidelone in the capsules obtained in the examples of the present application exists in an amorphous or molecular form.

Claims

A solid oral formulation comprising Utidelone, or a pharmaceutically acceptable salt, solvate or ester thereof as an active ingredient and a pharmaceutically acceptable excipient, wherein the formulation is a micropellet capsule encapsulating micropellets, or a tablet prepared by micropellet compression, wherein the micropellets are pellet cores coated with a coating layer comprising the active ingredient and said pharmaceutically acceptable excipient,
wherein the pharmaceutically acceptable excipient comprises a hydrophilic pharmaceutical excipient, a sustained-release pharmaceutical excipient, and optionally a surfactant, and

wherein the ratio of the active ingredient to the pharmaceutically acceptable excipient is in the range of 1:1 to 1:30.
The solid oral formulation according to claim 1, wherein the ratio of the active ingredient to the pharmaceutically acceptable excipient is in the range of 1:5 to 1:20.
The solid oral formulation according to any of claims 1 to 2, wherein the hydrophilic pharmaceutical excipient is selected from at least one of povidone, hypromellose, mannitol, lactose, sucrose, poloxamer and polyvinyl alcohol; the sustained-release pharmaceutical excipient is selected from at least one of povidone, hypromellose, polyethylene glycol, ethyl cellulose, polyvinyl acetal diethylamine acetate, hypromellose acetate succinate, acetate methacrylate copolymer, cellulose acetate, methyl cellulose, polyacrylic resin, polyvinyl phthalate, cellulose phthalate, and hypromellose phthalate; the surfactant is selected from at least one of polysorbate, polyoxyl castor oil, sodium lauryl sulfate, cholate, fatty acid glyceride, sorbitan, polyoxyethylene fatty acid ester, polyoxyethylene fatty alcohol ether, and poloxamer.
The solid oral formulation according to claim 3, wherein the hydrophilic pharmaceutical excipient is selected from at least one of low viscosity hypromellose, povidone and poloxamer; the sustained-release pharmaceutical excipient is selected from at least one of high viscosity hypromellose, high viscosity polyethylene glycol, ethyl cellulose and cellulose acetate; the surfactant is selected from at least one of polyoxyl castor oil, polysorbate and poloxamer.
The solid oral formulation according to any of claims 1-4, wherein the micropellet capsule or tablet comprises 2%-10% (w/w) of the active ingredient based on the weight of the micropellet or the weight of the tablet.
The solid oral formulation according to claim 5, wherein the micropellet capsule or tablet further comprises 30%-70% (w/w) of pharmaceutically acceptable excipients and 20%~60% (w/w) pellet core based on the weight of the micropellet or tablet.
The solid oral formulation according to any of claims 1-6, which is a micropellet capsule comprising Utidelone as an active ingredient, and polyoxyethylene (40) hydrogenated castor oil, low-viscosity hypromellose and high viscosity hypromellose as pharmaceutically acceptable excipients.
The solid oral formulation according to any of claims 1-7, wherein the active ingredient Utidelone is present in an amorphous or molecular form.
The solid oral formulation according to any of claims 1-8 for use in a method of treating a cancer selected from breast cancer, lung cancer, digestive tract tumors, lymphoid tumors, prostate cancer, brain cancer, gynecological tumors, liver cancer, head and neck tumors, ovarian cancer, colon cancer and stomach cancer.